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DERIVATIVE INSTRUMENTS (Fair Value of Derivative Instruments) (Details) (Designated as Hedging Instrument [Member], USD $) | 6 Months Ended
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Jun. 30, 2014
Interest Rate Swap [Member] |
Derivative instruments - risk management [Abstract] |
Termination date | Feb. 28, 2013
Notional amount | $ 200,000,000
Forward Contracts [Member] |
Derivative instruments - risk management [Abstract] |
Termination date | Mar. 31, 2014
Notional amount | $ 469,000

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | kex_DerivativeInstrumentsRiskManagementAbstract
Namespace Prefix: | kex_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DerivativeMaturityDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration